diff options
Diffstat (limited to 'include/openbsc/msgb.h')
-rw-r--r-- | include/openbsc/msgb.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/include/openbsc/msgb.h b/include/openbsc/msgb.h new file mode 100644 index 000000000..b0740edab --- /dev/null +++ b/include/openbsc/msgb.h @@ -0,0 +1,74 @@ +#ifndef _MSGB_H +#define _MSGB_H + +/* (C) 2008 by Harald Welte <laforge@gnumonks.org> + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +struct bts_link; + +struct msgb { + /* ptr to the incoming (RX) or outgoing (TX) BTS link */ + struct gsm_bts_link *bts_link; + + u_int8_t l2_off; + u_int8_t l3_off; + + u_int16_t data_len; + u_int16_t len; + + unsigned char *head; + unsigned char *tail; + unsigned char *data; + unsigned char _data[0]; +}; + +extern struct msgb *msgb_alloc(u_int16_t size); +extern void msgb_free(struct msgb *m); + +#define msgb_l2(m) ((void *)(m->data + m->l2_off)) +#define msgb_l3(m) ((void *)(m->data + m->l3_off)) + +static inline unsigned int msgb_headlen(const struct msgb *msgb) +{ + return msgb->len - msgb->data_len; +} +static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len) +{ + unsigned char *tmp = msgb->tail; + msgb->tail += len; + msgb->len += len; + return tmp; +} +static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len) +{ + msgb->data -= len; + msgb->len += len; + return msgb->data; +} +static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len) +{ + msgb->len -= len; + return msgb->data += len; +} +static inline int msgb_tailroom(const struct msgb *msgb) +{ + return (msgb->data + msgb->data_len) - msgb->tail; +} + +#endif /* _MSGB_H */ |